31. Avogadros number may represent_________________?

A. volume of particles
B. number of particles
C. mass of particles
D. All of the above

32. Size of molecule depends upon________________?

A. Atomicity
B. Shape of molecule
C. Both A and B
D. Difficult to predict

33. Which of the following terms is used for the mass of chlorine 35.5 ?

A. relative atomic mass
B. mass number
C. atomic weight
D. relative isotopic mass

34. Which one of the following is not the mono isotopic element ?

A. arsenic
B. uranium
C. iodine
D. nickel

35.  a.m.u =__________________?

A. 1.6 x 10-27 kg
B. 1.6 x 10-24 kg
C. 1.6 x 10-26 kg
D. 1.6 x 10-28 kg

36. Which of the following are iso electronic species ?

A. H+ H H-
B. Li+ Na+ K+
C. C1- Br- I
D. F- Ne Na+

37. Molecular ions are formed by passing______________________?

A. High energy electron beam
B. ? – particle
C. X-rays
D. All of the above

38. Which one is true about isotope ?

A. Same number of neutrons
B. Same mass number
C. Same physical properties
D. Same chemical properties

39. Which of the following ion formation is always exothermic ?

A. Uni-negative
B. Uni-positive
C. Di-negative
D. Di-positive

40. The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer_________________?

A. Gas
B. Liquid
C. Volatile solid
D. All

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